D4, D7, and D3 are connected such that current can only flow from the collector to the emitter of your transistors - that is backwards from the normal use of an NPN transistor.You have the 9V battery wired backwards. With a properly drawn circuit diagram, it becomes obvious that you have some serious problems. Simulate this circuit – Schematic created using CircuitLab Circuit diagrams are easier to understand and discuss. I'm going to start by drawing a circuit diagram from your wiring diagram.
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